Secrets of Yogic Breathing: Vayu Siddhi: A Guide to Pranayama, Ashtanga Yoga's Fourth LimbEbookSecrets of Yogic Breathing: Vayu Siddhi: A Guide to Pranayama, Ashtanga Yoga's Fourth LimbbyDavid GarriguesRating: 5 out of 5 stars5/5Save Secrets of Yogic Breathing: Vayu Siddhi: A Guide to Pranayama, Ashtanga Yoga's Fourth Limb for later